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libiscsi/lib/login.c

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/*
Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include "iscsi.h"
#include "iscsi-private.h"
#include "md5.h"
static int
iscsi_login_add_initiatorname(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send InitiatorName during opneg or the first leg of secneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG
&& iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
asprintf(&str, "InitiatorName=%s", iscsi->initiator_name);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
free(str);
return -1;
}
free(str);
return 0;
}
static int
iscsi_login_add_alias(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send InitiatorAlias during opneg or the first leg of secneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG
&& iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
asprintf(&str, "InitiatorAlias=%s", iscsi->alias);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
free(str);
return -1;
}
free(str);
return 0;
}
static int
iscsi_login_add_targetname(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send TargetName during opneg or the first leg of secneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG
&& iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
if (iscsi->target_name == NULL) {
iscsi_set_error(iscsi, "Trying normal connect but "
"target name not set.");
return -1;
}
asprintf(&str, "TargetName=%s", iscsi->target_name);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
free(str);
return -1;
}
free(str);
return 0;
}
static int
iscsi_login_add_sessiontype(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send TargetName during opneg or the first leg of secneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG
&& iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
switch (iscsi->session_type) {
case ISCSI_SESSION_DISCOVERY:
str = (char *)"SessionType=Discovery";
break;
case ISCSI_SESSION_NORMAL:
str = (char *)"SessionType=Normal";
break;
default:
iscsi_set_error(iscsi, "Can not handle sessions %d yet.",
iscsi->session_type);
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_headerdigest(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send HeaderDigest during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
switch (iscsi->want_header_digest) {
case ISCSI_HEADER_DIGEST_NONE:
str = (char *)"HeaderDigest=None";
break;
case ISCSI_HEADER_DIGEST_NONE_CRC32C:
str = (char *)"HeaderDigest=None,CRC32C";
break;
case ISCSI_HEADER_DIGEST_CRC32C_NONE:
str = (char *)"HeaderDigest=CRC32C,None";
break;
case ISCSI_HEADER_DIGEST_CRC32C:
str = (char *)"HeaderDigest=CRC32C";
break;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_datadigest(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send DataDigest during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"DataDigest=None";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_initialr2t(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send InitialR2T during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
asprintf(&str, "InitialR2T=%s", iscsi->want_initial_r2t == ISCSI_INITIAL_R2T_NO ?
"No" : "Yes");
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
free(str);
return -1;
}
free(str);
return 0;
}
static int
iscsi_login_add_immediatedata(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send ImmediateData during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
asprintf(&str, "ImmediateData=%s", iscsi->want_immediate_data == ISCSI_IMMEDIATE_DATA_NO ?
"No" : "Yes");
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
free(str);
return -1;
}
free(str);
return 0;
}
static int
iscsi_login_add_maxburstlength(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send MaxBurstLength during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
asprintf(&str, "MaxBurstLength=%d", iscsi->max_burst_length);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
free(str);
return -1;
}
free(str);
return 0;
}
static int
iscsi_login_add_firstburstlength(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send FirstBurstLength during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
asprintf(&str, "FirstBurstLength=%d", iscsi->first_burst_length);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
free(str);
return -1;
}
free(str);
return 0;
}
static int
iscsi_login_add_maxrecvdatasegmentlength(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send MaxRecvDataSegmentLength during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
asprintf(&str, "MaxRecvDataSegmentLength=%d", iscsi->initiator_max_recv_data_segment_length);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
free(str);
return -1;
}
free(str);
return 0;
}
static int
iscsi_login_add_datapduinorder(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send DataPduInOrder during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"DataPDUInOrder=Yes";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_defaulttime2wait(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send DefaultTime2Wait during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"DefaultTime2Wait=2";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_defaulttime2retain(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send DefaultTime2Retain during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"DefaultTime2Retain=0";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_ifmarker(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send IFMarker during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"IFMarker=No";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_ofmarker(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send OFMarker during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"OFMarker=No";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_maxconnections(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send MaxConnections during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"MaxConnections=1";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_maxoutstandingr2t(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send MaxOutstandingR2T during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"MaxOutstandingR2T=1";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_errorrecoverylevel(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send ErrorRecoveryLevel during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"ErrorRecoveryLevel=0";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_datasequenceinorder(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
/* We only send DataSequenceInOrder during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
str = (char *)"DataSequenceInOrder=Yes";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_authmethod(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
str = (char *)"AuthMethod=CHAP,None";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_authalgorithm(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_SELECT_ALGORITHM) {
return 0;
}
str = (char *)"CHAP_A=5";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_chap_username(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE) {
return 0;
}
str = (char *)"CHAP_N=";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str))
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu,
(unsigned char *)iscsi->user,
strlen(iscsi->user) +1) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
"failed.");
return -1;
}
return 0;
}
static int
h2i(int h)
{
if (h >= 'a' && h <= 'f') {
return h - 'a' + 10;
}
if (h >= 'A' && h <= 'F') {
return h - 'A' + 10;
}
return h - '0';
}
static int
i2h(int i)
{
if (i >= 10) {
return i - 10 + 'A';
}
return i + '0';
}
static int
iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char *str;
unsigned char c, cc[2];
unsigned char digest[16];
struct MD5Context ctx;
int i;
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE) {
return 0;
}
if (iscsi->chap_c == NULL) {
iscsi_set_error(iscsi, "No CHAP challenge found");
return -1;
}
MD5Init(&ctx);
c = iscsi->chap_i;
MD5Update(&ctx, &c, 1);
MD5Update(&ctx, (unsigned char *)iscsi->passwd, strlen(iscsi->passwd));
str = iscsi->chap_c;
while (*str != 0) {
c = (h2i(str[0]) << 4) | h2i(str[1]);
str += 2;
MD5Update(&ctx, &c, 1);
}
MD5Final(digest, &ctx);
str = (char *)"CHAP_R=0x";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str))
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
for (i=0; i<16; i++) {
c = digest[i];
cc[0] = i2h((c >> 4)&0x0f);
cc[1] = i2h((c )&0x0f);
if (iscsi_pdu_add_data(iscsi, pdu, &cc[0], 2) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
"failed.");
return -1;
}
}
c = 0;
if (iscsi_pdu_add_data(iscsi, pdu, &c, 1) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
"failed.");
return -1;
}
return 0;
}
int
iscsi_login_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
void *private_data)
{
struct iscsi_pdu *pdu;
int transit;
if (iscsi->login_attempts++ > 10) {
iscsi_set_error(iscsi, "login took too many tries."
" giving up.");
return -1;
}
if (iscsi->is_loggedin != 0) {
iscsi_set_error(iscsi, "Trying to login while already logged "
"in.");
return -1;
}
switch (iscsi->session_type) {
case ISCSI_SESSION_DISCOVERY:
case ISCSI_SESSION_NORMAL:
break;
default:
iscsi_set_error(iscsi, "trying to login without setting "
"session type.");
return -1;
}
pdu = iscsi_allocate_pdu(iscsi, ISCSI_PDU_LOGIN_REQUEST,
ISCSI_PDU_LOGIN_RESPONSE);
if (pdu == NULL) {
iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate "
"login pdu.");
return -1;
}
/* login request */
iscsi_pdu_set_immediate(pdu);
if (iscsi->user == NULL) {
iscsi->current_phase = ISCSI_PDU_LOGIN_CSG_OPNEG;
}
if (iscsi->current_phase == ISCSI_PDU_LOGIN_CSG_SECNEG) {
iscsi->next_phase = ISCSI_PDU_LOGIN_NSG_OPNEG;
}
if (iscsi->current_phase == ISCSI_PDU_LOGIN_CSG_OPNEG) {
iscsi->next_phase = ISCSI_PDU_LOGIN_NSG_FF;
}
transit = 0;
if (iscsi->current_phase == ISCSI_PDU_LOGIN_CSG_OPNEG) {
transit = ISCSI_PDU_LOGIN_TRANSIT;
}
if (iscsi->current_phase == ISCSI_PDU_LOGIN_CSG_SECNEG) {
if (iscsi->secneg_phase == ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
transit = ISCSI_PDU_LOGIN_TRANSIT;
}
if (iscsi->secneg_phase == ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE) {
transit = ISCSI_PDU_LOGIN_TRANSIT;
}
}
/* flags */
iscsi_pdu_set_pduflags(pdu, transit
| iscsi->current_phase
| iscsi->next_phase);
/* initiator name */
if (iscsi_login_add_initiatorname(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* optional alias */
if (iscsi->alias) {
if (iscsi_login_add_alias(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
}
/* target name */
if (iscsi->session_type == ISCSI_SESSION_NORMAL) {
if (iscsi_login_add_targetname(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
}
/* session type */
if (iscsi_login_add_sessiontype(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* header digest */
if (iscsi_login_add_headerdigest(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* auth method */
if (iscsi_login_add_authmethod(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* auth algorithm */
if (iscsi_login_add_authalgorithm(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* chap username */
if (iscsi_login_add_chap_username(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* chap response */
if (iscsi_login_add_chap_response(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* data digest */
if (iscsi_login_add_datadigest(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* initial r2t */
if (iscsi_login_add_initialr2t(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* immediate data */
if (iscsi_login_add_immediatedata(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* max burst length */
if (iscsi_login_add_maxburstlength(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* first burst length */
if (iscsi_login_add_firstburstlength(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* default time 2 wait */
if (iscsi_login_add_defaulttime2wait(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* default time 2 retain */
if (iscsi_login_add_defaulttime2retain(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* max outstanding r2t */
if (iscsi_login_add_maxoutstandingr2t(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* errorrecoverylevel */
if (iscsi_login_add_errorrecoverylevel(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* ifmarker */
if (iscsi_login_add_ifmarker(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* ofmarker */
if (iscsi_login_add_ofmarker(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* maxconnections */
if (iscsi_login_add_maxconnections(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* max recv data segment length */
if (iscsi_login_add_maxrecvdatasegmentlength(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* data pdu in order */
if (iscsi_login_add_datapduinorder(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
/* data sequence in order */
if (iscsi_login_add_datasequenceinorder(iscsi, pdu) != 0) {
iscsi_free_pdu(iscsi, pdu);
return -1;
}
pdu->callback = cb;
pdu->private_data = private_data;
if (iscsi_queue_pdu(iscsi, pdu) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: failed to queue iscsi "
"pdu.");
iscsi_free_pdu(iscsi, pdu);
return -1;
}
return 0;
}
static const char *login_error_str(int status)
{
switch (status) {
case 0x0101: return "Target moved temporarily";
case 0x0102: return "Target moved permanently";
case 0x0200: return "Initiator error";
case 0x0201: return "Authentication failure";
case 0x0202: return "Authorization failure";
case 0x0203: return "Target not found";
case 0x0204: return "Target removed";
case 0x0205: return "Unsupported version";
case 0x0206: return "Too many connections";
case 0x0207: return "Missing parameter";
case 0x0208: return "Can't include in session";
case 0x0209: return "Session type not supported";
case 0x020a: return "Session does not exist";
case 0x020b: return "Invalid during login";
case 0x0300: return "Target error";
case 0x0301: return "Service unavailable";
case 0x0302: return "Out of resources";
}
return "Unknown login error";
}
int
iscsi_process_login_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
struct iscsi_in_pdu *in)
{
int status;
unsigned char *ptr = in->data;
int size = in->data_pos;
status = ntohs(*(uint16_t *)&in->hdr[36]);
if (status != 0) {
iscsi_set_error(iscsi, "Failed to log in to target. Status: %s(%d)",
login_error_str(status), status);
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
return 0;
}
iscsi->statsn = ntohs(*(uint16_t *)&in->hdr[24]);
/* XXX here we should parse the data returned in case the target
* renegotiated some some parameters.
* we should also do proper handshaking if the target is not yet
* prepared to transition to the next stage
*/
while (size > 0) {
int len;
len = strlen((char *)ptr);
if (len == 0) {
break;
}
if (len > size) {
iscsi_set_error(iscsi, "len > size when parsing "
"login data %d>%d", len, size);
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
return -1;
}
/* parse the strings */
if (!strncmp((char *)ptr, "HeaderDigest=", 13)) {
if (!strcmp((char *)ptr + 13, "CRC32C")) {
iscsi->header_digest
= ISCSI_HEADER_DIGEST_CRC32C;
iscsi->want_header_digest
= ISCSI_HEADER_DIGEST_CRC32C;
} else {
iscsi->header_digest
= ISCSI_HEADER_DIGEST_NONE;
iscsi->want_header_digest
= ISCSI_HEADER_DIGEST_NONE;
}
}
if (!strncmp((char *)ptr, "FirstBurstLength=", 17)) {
iscsi->first_burst_length = strtol((char *)ptr + 17, NULL, 10);
}
if (!strncmp((char *)ptr, "InitialR2T=", 11)) {
if (!strcmp((char *)ptr + 11, "No")) {
iscsi->use_initial_r2t = ISCSI_INITIAL_R2T_NO;
} else {
iscsi->use_initial_r2t = ISCSI_INITIAL_R2T_YES;
}
}
if (!strncmp((char *)ptr, "ImmediateData=", 14)) {
if (!strcmp((char *)ptr + 14, "No")) {
iscsi->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
} else {
iscsi->use_immediate_data = ISCSI_IMMEDIATE_DATA_YES;
}
}
if (!strncmp((char *)ptr, "MaxBurstLength=", 15)) {
iscsi->max_burst_length = strtol((char *)ptr + 15, NULL, 10);
}
if (!strncmp((char *)ptr, "MaxRecvDataSegmentLength=", 25)) {
iscsi->target_max_recv_data_segment_length = strtol((char *)ptr + 25, NULL, 10);
}
if (!strncmp((char *)ptr, "AuthMethod=", 11)) {
if (!strcmp((char *)ptr + 11, "CHAP")) {
iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_SELECT_ALGORITHM;
}
}
if (!strncmp((char *)ptr, "CHAP_A=", 7)) {
iscsi->chap_a = atoi((char *)ptr+7);
iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE;
}
if (!strncmp((char *)ptr, "CHAP_I=", 7)) {
iscsi->chap_i = atoi((char *)ptr+7);
iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE;
}
if (!strncmp((char *)ptr, "CHAP_C=0x", 9)) {
free(iscsi->chap_c);
iscsi->chap_c = strdup((char *)ptr+9);
if (iscsi->chap_c == NULL) {
iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup CHAP challenge.");
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL, pdu->private_data);
return -1;
}
iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE;
}
ptr += len + 1;
size -= len + 1;
}
if (in->hdr[1] & ISCSI_PDU_LOGIN_TRANSIT) {
iscsi->current_phase = (in->hdr[1] & ISCSI_PDU_LOGIN_NSG_FF) << 2;
}
if ((in->hdr[1] & ISCSI_PDU_LOGIN_TRANSIT)
&& (in->hdr[1] & ISCSI_PDU_LOGIN_NSG_FF) == ISCSI_PDU_LOGIN_NSG_FF) {
iscsi->is_loggedin = 1;
pdu->callback(iscsi, SCSI_STATUS_GOOD, NULL, pdu->private_data);
} else {
if (iscsi_login_async(iscsi, pdu->callback, pdu->private_data) != 0) {
iscsi_set_error(iscsi, "Failed to send continuation login pdu");
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL, pdu->private_data);
}
}
return 0;
}
int
iscsi_logout_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
void *private_data)
{
struct iscsi_pdu *pdu;
iscsi->login_attempts = 0;
if (iscsi->is_loggedin == 0) {
iscsi_set_error(iscsi, "Trying to logout while not logged in.");
return -1;
}
pdu = iscsi_allocate_pdu(iscsi, ISCSI_PDU_LOGOUT_REQUEST,
ISCSI_PDU_LOGOUT_RESPONSE);
if (pdu == NULL) {
iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate "
"logout pdu.");
return -1;
}
/* logout request has the immediate flag set */
iscsi_pdu_set_immediate(pdu);
/* flags : close the session */
iscsi_pdu_set_pduflags(pdu, 0x80);
pdu->callback = cb;
pdu->private_data = private_data;
if (iscsi_queue_pdu(iscsi, pdu) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: failed to queue iscsi "
"logout pdu.");
iscsi_free_pdu(iscsi, pdu);
return -1;
}
return 0;
}
int
iscsi_process_logout_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
struct iscsi_in_pdu *in _U_)
{
iscsi->is_loggedin = 0;
pdu->callback(iscsi, SCSI_STATUS_GOOD, NULL, pdu->private_data);
return 0;
}
int
iscsi_set_session_type(struct iscsi_context *iscsi,
enum iscsi_session_type session_type)
{
if (iscsi->is_loggedin) {
iscsi_set_error(iscsi, "trying to set session type while "
"logged in");
return -1;
}
iscsi->session_type = session_type;
return 0;
}
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